Alberani, V., De Castro Pietrangeli, P., & Mazza, A. M. (1990). The use of grey literature in health sciences: A preliminary survey. Bulletin of the Medical Library Association, 78(4), 358–363.
Auger, P. (1998). Information sources in grey literature. Walter de Gruyter GmbH.
Boland, A., Cherry, M.G., & Dickson, R. (Eds.). (2017). Doing a systematic review: A student's guide, 2nd edition. SAGE Publishing.
Cumpston, M., Chandler, J. (2021). Chapter II: Planning a Cochrane review. In J.P.T. Higgins, J. Thomas, J. Chandler, M. Cumpston, T. Li, M.J. Page, V.A. Welch (Eds.), Cochrane handbook for systematic reviews of interventions (Version 6.2). Cochrane. Available from www.training.cochrane.org/handbook.
Environmental epidemiology, volume 2: Use of the gray literature and other data in environmental epidemiology. (1997). National Academies Press.
Farace, D.J. (1998). Foreword. In Third international conference on grey literature: Perspectives on the design and transfer of scientific and technical information, 13-14 November 1997 in Luxembourg. GL'97 Conference Proceedings, p. iii. Accessed from http://greyguide.isti.cnr.it/attachments/category/30/GL97_first.pdf.
Farace, D., & Schöpfel, J. (Eds.). (2010). Grey literature in library and information studies. De Gruyter, Inc.
Farrah K. & Mierzwinski-Urban, M. (2019). Almost half of references in reports on new and emerging nondrug health technologies are grey literature. Journal of the Medical Library Association, 107(1), 43-48. https://www.doi.org/10.5195/jmla.2019.539.
Godin, K., Stapleton, J., Kirkpatrick, S.I., Hanning, R.M., & Leatherdale, S.T. (2015). Applying systematic review search methods to the grey literature: A case study examining guidelines for school-based breakfast programs in Canada. Systematic Reviews, 4, 138. https://doi.org/10.1186/s13643-015-0125-0.
GreyNet International. GreyNet International, Grey Literature Network Service. (n.d.). Retrieved March 15, 2022, from http://www.greynet.org/.
Woods, S., Phillips, K., & Dudash, A. (2020). Grey literature citations in top nursing journals: A bibliometric study. Journal of the Medical Library Association, 108(2), 262–269. https://doi.org/10.5195/jmla.2020.760.
